KR102385273B1 - Electric compressor and manufacturing method for electric compressor - Google Patents

Abstract

[Task] To improve installation workability while suppressing oversize.
[Solution] The cover 14 is provided with an insertion hole 14h through which the fixing bolt 50 screwed to the motor housing 13 is inserted. The nut 46 is provided with a temporary fixing bolt 54 for temporarily fixing the cover 14 to the holder 40 and a female threaded hole 49 capable of being screwed. The nominal diameter r1 of the female threaded hole 49 is larger than the nominal diameter r2 of the threaded portion 51 of the fixing bolt 50 . The fixing bolt 50 is screwed to the motor housing 13 at the screw portion 51 while being inserted through the insertion hole 14h and the female screw hole 49, so that the cover 14, the holder 40, and the motor housing are screwed together. (13) is concluded.

Description

An electric compressor and the manufacturing method of an electric compressor TECHNICAL FIELD

The present invention relates to an electric compressor and a method for manufacturing the electric compressor.

The electric compressor comprises: a motor control device having a compression unit for compressing a fluid; an electric motor for driving the compression unit; a circuit board for driving the electric motor; a housing for accommodating the compression unit and the electric motor; It has a cover to accommodate it. The cover is attached to the housing. Moreover, as disclosed by patent document 1, for example, an electric compressor is equipped with the holder which holds a circuit board.

Japanese Laid-Open Patent Publication No. 2015-40538

By the way, in the electric compressor of patent document 1, in order to attach a cover to a housing, the holder is attached to a housing by first screwing the 1st bolt which penetrates the holder to the housing. Then, the cover is attached to the holder by screwing the second bolt passing through the cover to the holder, whereby the cover is attached to the housing via the holder. Therefore, in the electric compressor of patent document 1, after attaching a holder to a housing, since it is necessary to attach a cover to a holder, installation workability is bad.

So, for example, it is also considered to temporarily fix the cover and the holder using the temporary fixing bolts, and to mount the cover and the holder to the housing with the fixing bolts in a state in which the cover and the holder are integrated in advance. In this case, in addition to the fixing bolts for fixing the cover to the housing, the number of temporary fixing bolts and the number of bolts increases, so that the electric compressor becomes large. In addition, even when the cover and the holder are previously integrated by other fixing means, research for effectively functioning the fixing means and research for positioning the cover and the holder are required, and as a result, the electric compressor is enlarged.

The present invention has been made in order to solve the above problems, and an object thereof is to provide a motor-driven compressor capable of improving installation workability while suppressing an increase in size, and a method for manufacturing the motor-compressor.

A motor control device having a compression unit for compressing a fluid, an electric motor for driving the compression unit, and a circuit board for driving the electric motor, and the compression unit and the electric motor a housing for accommodating the motor control device, a cover for accommodating the motor control device, and a holder for holding the circuit board, wherein the cover is an electric compressor mounted on the housing, wherein the cover is screwed to the housing An insertion hole through which a fixing bolt is inserted is formed, and the holder has a female threaded hole capable of screwing with a temporary fixing bolt for temporarily fixing the cover to the holder, and the nominal diameter of the female threaded hole is that of the fixing bolt. Larger than the nominal diameter of the screw portion, the fixing bolt is screwed to the housing at the screw portion while passing through the insertion hole and the female screw hole, thereby fastening the cover, the holder, and the housing.

According to this, by screwing the temporary fixing bolt to the female screw hole and temporarily fixing the cover to the holder, the cover and the holder can be integrated in advance using the temporary fixing bolt. Then, the temporary fixing bolt is removed from the female screw hole in a state where the cover and the holder integrated in advance are arranged at a predetermined position with respect to the housing. Here, the nominal diameter of the female threaded hole is larger than the nominal diameter of the threaded portion of the fixing bolt. That is, the diameter formed by the thread tip of the female screw hole is larger than the diameter formed by the thread tip of the thread part of the fixing bolt. Accordingly, the screw portion of the fixing bolt can be screwed to the housing while passing through the insertion hole and the female screw hole, and the cover, the holder, and the housing can be fastened with the fixing bolt. In this way, since the cover and holder integrated in advance can be installed with respect to a housing|casing, installation workability improves. Further, there is no need to previously integrate the cover and the holder by other fixing means. Then, the temporary fixing bolt used to integrate the cover and the holder in advance is removed from the female screw hole, and the fixing bolt is screwed into the housing while passing the insertion hole and the female screw hole. was made to contract. Therefore, as in the prior art, in addition to the fixing bolts for fixing the cover to the housing, it is avoided that the number of the temporary fixing bolts and the number of bolts increase, so that the enlargement of the electric compressor can be suppressed. By the above, installation workability can be improved, suppressing enlargement.

In the motor-driven compressor, the holder has a metal support post and a resin holder body part, the support post has the female screw hole and is integrally formed with the holder body part, the support post comprising: What is necessary is just to be pinched|interposed by the said cover and the said housing.

According to this, since the holder main body is made of resin, the weight of the holder can be reduced, and as a result, the weight of the electric compressor can be reduced. Further, when the threaded portion of the fixing bolt passed through the insertion hole and the female threaded hole is screwed to the housing, the support column receives the axial force of the fixing bolt in a state held by the cover and the housing. At this time, since the supporting pillar is made of metal, the axial force of the fixing bolt can be preferably received while the supporting pillar is sandwiched by the cover and the housing. As a result, the axial force of the fixing bolt screwed to the housing is easily transmitted to the cover, the support pillar, and the housing, so that the cover can be firmly attached to the housing via the holder.

In the motor-driven compressor, an external connector to which an external power source is connected is provided, wherein the external connector has a connector connecting portion normally protruding from the cover and a bus bar held in the connector connecting portion, wherein the circuit board includes: It should be connected to the bar.

According to this, since the circuit board and the bus bar of the external connector are connected, when the temporary fixing bolt is removed from the female screw hole with the cover and the holder integrated in advance arranged at a predetermined position with respect to the housing, the cover and Misalignment of the holder can be suppressed. Accordingly, the positions of the insertion hole of the cover and the female screw hole of the holder do not easily shift, and the installation workability can be further improved.

A method of manufacturing an electric compressor for solving the above problems includes: a motor control device having a compression unit for compressing a fluid; an electric motor for driving the compression unit; and a circuit board for driving the electric motor; A method of manufacturing an electric compressor, comprising: a housing for accommodating an electric motor; a cover for accommodating the motor control device; and a holder for holding the circuit board, wherein the cover is mounted on the housing. an arrangement step of disposing the holder to the housing while the cover is temporarily fixed to the holder by screwing a temporary fixing bolt to the female screw hole; and after the arrangement step, the holder is moved to a predetermined position with respect to the housing In a state disposed in a state in which the temporary fixing bolt is removed from the female screw hole, and after the removing step, the screw portion of the fixing bolt is passed through the insertion hole and the female screw hole formed in the cover in this order. and a fastening step of fastening the cover, the holder, and the housing by the fixing bolts by screwing them to the housing.

First, in a state in which the cover is temporarily fixed to the holder by screwing the temporary fixing bolt to the female screw hole, an arrangement process of arranging the holder in the housing is performed, and after the arrangement process, the holder is arranged in a predetermined position with respect to the housing In , a removal process of removing the temporary fixing bolt from the female threaded hole is performed. Then, after the removing step, a fastening step of fastening the cover, the holder, and the housing with the fixing bolt is performed by allowing the screw portion of the fixing bolt to pass through the insertion hole and the female screw hole in this order to be screwed to the housing. In this way, since the cover and holder integrated in advance can be installed with respect to a housing|casing, installation workability improves. Further, there is no need to previously integrate the cover and the holder by other fixing means. Then, the temporary fixing bolt used to integrate the cover and the holder in advance is removed from the female screw hole, and the fixing bolt is screwed into the housing while passing the insertion hole and the female screw hole. was made to contract. Therefore, as in the prior art, in addition to the fixing bolts for fixing the cover to the housing, it is avoided that the number of the temporary fixing bolts and the number of bolts increases, so that the enlargement of the electric compressor can be suppressed. By the above, installation workability can be improved, suppressing enlargement.

According to this invention, installation workability can be improved, suppressing enlargement.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side sectional view which shows the electric compressor in embodiment.
Fig. 2 is an enlarged cross-sectional view partially showing the electric compressor.
3 : is sectional drawing which expands and shows the periphery of a fixing bolt.
Fig. 4 is a side cross-sectional view showing a state in which the cover and the holder are previously integrated.
5 : is sectional drawing which enlarges and shows the periphery of a temporary fixing bolt.

Hereinafter, one embodiment in which the electric compressor is embodied will be described with reference to FIGS. 1 to 5 . The electric compressor of the present embodiment is used, for example, in a vehicle air conditioner.

As shown in FIG. 1 , the electric compressor 10 is provided with a normal housing 11 . The housing 11 has a bottomed normal discharge housing 12 and a bottomed normal motor housing 13 connected to the discharge housing 12 . The discharge housing 12 and the motor housing 13 are made of a metal material, for example, made of aluminum. The motor housing 13 has a plate-shaped bottom wall 13a and a peripheral wall 13b extending normally from the outer peripheral edge of the bottom wall 13a. In the peripheral wall 13b of the motor housing 13, a suction port 13h for sucking a refrigerant as a fluid into the motor housing 13 is formed.

The motor-driven compressor 10 is provided with a cover 14 . The cover 14 is made of a metal material, for example, made of aluminum. The cover 14 has a plate-shaped bottom wall 14a and a peripheral wall 14b extending normally from the outer peripheral edge of the bottom wall 14a. The cover 14 is attached to the bottom wall 13a of the motor housing 13 in a state where the axial center of the peripheral wall 14b coincides with the axial center of the peripheral wall 13b of the motor housing 13 .

The rotation shaft 15 is accommodated in the motor housing 13 . The rotating shaft 15 is accommodated in the motor housing 13 in a state where the axis of the rotating shaft 15 coincides with the axial center of the peripheral wall 13b of the motor housing 13 . Moreover, in the motor housing 13, the compression part 16 which is driven by rotation of the rotating shaft 15 to compress a refrigerant|coolant, and the electric motor 17 which rotates the rotating shaft 15 and drives the compression part 16 ) is accepted. Accordingly, the housing 11 accommodates the compression unit 16 and the electric motor 17 . The compression part 16 and the electric motor 17 are arrange|positioned side by side in the axial direction which is the direction in which the axial line of the rotating shaft 15 extends. The electric motor 17 is arrange|positioned at the bottom wall 13a side of the motor housing 13 rather than the compression part 16. As shown in FIG.

The compression unit 16 is, for example, a scroll type composed of a fixed scroll (not shown) fixed in the motor housing 13 and a movable scroll (not shown) disposed opposite to the fixed scroll.

The electric motor 17 is comprised by the normal stator 18 and the rotor 19 arrange|positioned inside the stator 18. As shown in FIG. The rotor 19 rotates integrally with the rotating shaft 15 . The stator 18 surrounds the rotor 19 . The rotor 19 has a rotor core 19a fixedly mounted to the rotating shaft 15, and a plurality of permanent magnets (not shown) formed on the rotor core 19a. The stator 18 has a normal stator core 18a and a motor coil 18b wound around the stator core 18a.

One end of an external refrigerant circuit (not shown) is connected to the suction port 13h. The discharge housing 12 is provided with a discharge port 12h. The other end of the external refrigerant circuit is connected to the discharge port 12h. The refrigerant sucked into the motor housing 13 from the external refrigerant circuit through the suction port 13h is compressed in the compression unit 16 by driving the compression unit 16, and flows out to the external refrigerant circuit through the discharge port 12h. do. Then, the refrigerant flowing out to the external refrigerant circuit passes through a heat exchanger or an expansion valve of the external refrigerant circuit and refluxes into the motor housing 13 through the suction port 13h. The electric compressor 10 and the external refrigerant circuit constitute a vehicle air conditioner.

A drive circuit chamber 20 is formed between the cover 14 and the outer surface 13c of the bottom wall 13a of the motor housing 13, which is a surface on the opposite side to the peripheral wall 13b. A motor control device 21 is housed in the drive circuit chamber 20 . Accordingly, the cover 14 houses the motor control device 21 . Accordingly, the motor control device 21 is covered by the cover 14 . The compression unit 16 , the electric motor 17 , and the motor control device 21 are arranged side by side in the axial direction of the rotating shaft 15 in this order.

As shown in FIG. 2 , the motor control device 21 includes a circuit board 22 for driving the electric motor 17 . A plurality of electronic components 23 are mounted on the circuit board 22 . Accordingly, the motor control device 21 includes a plurality of electronic components 23 . As the some electronic component 23, filter elements, such as a coil and a capacitor|condenser, a switching element, etc. are mentioned, for example.

The electric compressor 10 is provided with the external connector 31 to which the external power supply 30 is connected. The external connector 31 has a connector connecting portion 32 and a bus bar 33 . The connector connecting portion 32 normally protrudes from an outer surface 14c of the bottom wall 14a of the cover 14 on the opposite side to the peripheral wall 14b. The bus bar 33 is held by the connector connecting portion 32 via a resin insulating member 34 . The bus bar 33 is an elongate plate shape. One end of the bus bar 33 is located inside the connector connecting portion 32 . The other end of the bus bar 33 protrudes from the inside of the connector connection part 32 into the cover 14 and penetrates the circuit board 22, for example, by soldering or the like to the circuit board 22. is connected to Accordingly, the circuit board 22 is connected to the bus bar 33 . Then, electric power from the external power supply 30 connected to the external connector 31 is supplied to the circuit board 22 via the bus bar 33 .

The motor-driven compressor 10 includes a circuit board 22 and a holder 40 for holding a plurality of electronic components 23 . The holder 40 has a plate-shaped resin-made holder main body 41 . As for the holder main body part 41, one surface of the plate thickness direction of the holder main body part 41 becomes the mounting surface 41a on which the circuit board 22 is mounted. The circuit board 22 is mounted on the mounting surface 41a of the holder body 41 in a state where the plate thickness direction of the circuit board 22 coincides with the plate thickness direction of the holder body 41 .

On the outer surface 13c of the bottom wall 13a of the motor housing 13, a plurality of boss portions 13f are formed to protrude. The protrusion lengths from the outer surface 13c of the bottom wall 13a of each boss 13f are the same, respectively. A boss female screw hole 13g is formed in each boss part 13f. And the other surface of the holder main-body part 41 in the plate|board thickness direction becomes the contact surface 41b which contacts each boss part 13f of the motor housing 13. As shown in FIG. Moreover, in the contact surface 41b of the holder main body part 41, the normal holding wall 41c which hold|maintains each electronic component 23 protrudes, respectively. And each electronic component 23 is hold|maintained by each holding wall 41c in the state respectively accommodated in each holding wall 41c. Moreover, between each electronic component 23 and each holding wall 41c, the adhesive agent is apply|coated, for example, and each electronic component 23 does not fall from each holding wall 41c.

The lead wire 23a of each electronic component 23 penetrates the holder body part 41 in the plate|board thickness direction, and protrudes from the mounting surface 41a of the holder body part 41. As shown in FIG. And in the state where the part which protruded from the mounting surface 41a of the holder main body part 41 in the lead wire 23a of each electronic component 23 penetrated the circuit board 22, for example, soldering It is connected to the circuit board 22 by etc. Thereby, each electronic component 23 is respectively mounted on the circuit board 22 via the lead wire 23a.

As shown in FIG. 3 , a plurality of positioning holes 22a are formed in the circuit board 22 . In addition, a plurality of positioning projections 42 are formed to protrude from the mounting surface 41a of the holder main body 41 . Each positioning projection 42 is capable of being inserted into each positioning hole 22a of the circuit board 22 . The circuit board 22 is mounted on the mounting surface 41a of the holder main body 41 in a state where each positioning projection 42 is inserted into each positioning hole 22a. The circuit board 22 is hold|maintained by the holder 40 in the state positioned with respect to the holder 40 by each positioning projection 42 being inserted into each positioning hole 22a.

The holder 40 has a plurality of boss portions 43 protruding from the mounting surface 41a of the holder body portion 41 . Each boss portion 43 has a cylindrical shape. Each boss portion 43 is disposed at a position corresponding to each boss portion 13f of the motor housing 13 on the mounting surface 41a of the holder body portion 41, respectively. Moreover, in the holder main body part 41, the communication hole 44 which respectively communicates with the inner side of each boss part 43 is formed. Each communication hole 44 penetrates the holder main body 41 in the plate thickness direction. One end of each communication hole 44 communicates with the inside of each boss portion 43 , and the other end of each communication hole 44 is opened in the contact surface 41b of the holder body portion 41 . The pore diameter of each communication hole 44 is the same as the inner diameter of each boss part 43 . And the inner side of the communication hole 44 and the boss|hub part 43 forms the nut holding hole 45. As shown in FIG. Accordingly, the holder 40 has a plurality of nut holding holes 45 .

The holder 40 has a plurality of nuts 46 . Each nut 46 is held by each nut holding hole 45 in the state inserted in each nut holding hole 45 . Each nut 46 is formed in a state integrated with the holder body 41 by insert molding into the holder body 41 . Therefore, each nut 46 is made of metal integrally formed with the holder body part 41 .

The nut 46 includes a cylindrical portion 47 and an annular flange portion 48 protruding outward from a site located at one end in the axial direction of the cylindrical portion 47 on the outer peripheral surface of the cylindrical portion 47 . has a The inner side of the cylindrical portion 47 is formed with a female threaded hole 49 . Accordingly, the nut 46 has a female threaded hole 49 . One end of the cylindrical portion 47 protrudes from the end opposite to the mounting surface 41a of the boss portion 43 . One end of the cylindrical portion 47 and the flange portion 48 are in contact with the inner surface 14d, which is a surface of the bottom wall 14a of the cover 14 on the circumferential wall 14b side. Further, the other end of the cylindrical portion 47 is in contact with the boss portion 13f of the motor housing 13 . And each nut 46 functions as a support post which maintains the space|interval between the inner surface 14d of the cover 14, and each boss|hub part 13f of the motor housing 13. As shown in FIG. Therefore, the holder 40 has a support post which maintains the space|interval between the cover 14 and the motor housing 13. As shown in FIG.

A plurality of insertion holes 14h are formed in the bottom wall 14a of the cover 14 . In the present embodiment, four insertion holes 14h are formed in the bottom wall 14a of the cover 14 at equal intervals in the circumferential direction along the circumferential wall 14b. A fixing bolt 50 screwed to each boss portion 13f of the motor housing 13 is inserted through each insertion hole 14h. Specifically, the threaded portion 51 of each fixing bolt 50 is inserted through each insertion hole 14h.

The nominal diameter r1 of the female threaded hole 49 is larger than the nominal diameter r2 of the threaded portion 51 of the fixing bolt 50 . That is, the diameter r1 formed by the threaded tip of the female threaded hole 49 is larger than the diameter r2 formed by the threaded tip of the threaded portion 51 of the fixing bolt 50 . Accordingly, the threaded portion 51 of the fixing bolt 50 that has passed through the insertion hole 14h passes through the inner side of the female threaded hole 49 . Moreover, the hole diameter r3 of the insertion hole 14h is larger than the nominal diameter r1 of the female threaded hole 49. As shown in FIG. The head portion 52 of the fixing bolt 50 is larger than the insertion hole 14h. The head portion 52 of the fixing bolt 50 has an annular washer 53 interposed therebetween around the insertion hole 14h in the outer surface 14c of the bottom wall 14a of the cover 14. is pressurized. The outer edge of the washer 53 is larger than the head portion 52 , and the inner edge of the washer 53 is smaller than the head portion 52 . The washer 53 seals between the head portion 52 of the fixing bolt 50 and the outer surface 14c of the bottom wall 14a of the cover 14 .

The end of the screw portion 51 of the fixing bolt 50 on the opposite side to the head portion 52 is screwed into the boss female screw hole 13g of the boss portion 13f of the motor housing 13 . And the cover 14 is each nut 46 by screwing the threaded part 51 of each fixing bolt 50 to the boss female threaded hole 13g of each boss part 13f of the motor housing 13, respectively. It is attached to the motor housing 13 via the holder 40 in a state in which the space|interval with respect to the motor housing 13 is maintained by this. Each nut 46 is sandwiched by the cover 14 and the motor housing 13 . Each fixing bolt 50 is screwed to the motor housing 13 at the threaded portion 51 while passing through each insertion hole 14h and each female threaded hole 49, whereby the cover 14 and the holder 40 are screwed together. and the motor housing 13 are fastened.

Next, the operation|action of this embodiment is demonstrated, demonstrating the manufacturing method of the electric compressor 10 of this embodiment. Here, as a manufacturing method of the electric compressor 10, the installation method of the cover 14 and the holder 40 with respect to the motor housing 13 is demonstrated.

4 and 5, when installing the cover 14 and the holder 40 to the motor housing 13, first, before installing the cover 14 and the holder 40 to the motor housing 13 , the cover 14 and the holder 40 are integrated in advance. Specifically, the cover 14 and the holder 40 are integrated using the temporary fixing bolt 54 capable of being screwed into the female threaded hole 49 . At this time, since the hole diameter r3 of the insertion hole 14h is larger than the nominal diameter r1 of the female threaded hole 49, a temporary fixing bolt 54 capable of being screwed into the female threaded hole 49 is inserted into the insertion hole. Through (14h), it is possible to screw into the female threaded hole (49). Moreover, the temporary fixing bolt 54 is inserted through the two insertion holes 14h which exist on the diagonal line among the four insertion holes 14h. Then, an arrangement step of disposing the holder 40 to the motor housing 13 in a state in which the cover 14 is temporarily fixed to the holder 40 by screwing the temporary fixing bolt 54 to the female screw hole 49 . carry out

Next, after the arrangement step, a removal step of removing the temporary fixing bolt 54 from the female screw hole 49 is performed in a state where the holder 40 is disposed at a predetermined position with respect to the motor housing 13 . . Specifically, the other end of the cylindrical portion 47 of each nut 46 is in contact with each boss portion 13f of the motor housing 13, respectively, and each female threaded hole 49 is each boss female threaded hole ( 13g), the cover 14 and the holder 40 are disposed with respect to the motor housing 13 at a position in communication with the motor housing 13 . Then, the temporary fixing bolt 54 is removed from the female screw hole 49 . At this time, since the circuit board 22 and the bus bar 33 are connected, when the temporary fixing bolt 54 is removed from the female screw hole 49, the displacement of the cover 14 and the holder 40 is suppressed. has been Therefore, the positions of the insertion hole 14h of the cover 14 and the female screw hole 49 of the nut 46 are not easily shifted.

Next, as shown in Figs. 2 and 3, after the removing step, in a state in which the threaded portion 51 of the fixing bolt 50 is passed through the inside of the washer 53, the threaded portion 51 is inserted into the insertion hole ( 14h) and the female threaded hole 49 pass in this order and screwed to the boss female threaded hole 13g, thereby fastening the cover 14, the holder 40, and the motor housing 13 with the fixing bolt 50. carry out the process. At this time, one end of the cylindrical portion 47 and the flange portion 48 are in contact with the inner surface 14d of the bottom wall 14a of the cover 14, which is the surface on the circumferential wall 14b side, and the cylinder The other end of the portion 47 is in contact with the boss portion 13f of the motor housing 13 . For this reason, the nut 46 is clamped by the inner surface 14d of the bottom wall 14a of the cover 14 and the boss portion 13f of the motor housing 13 to reduce the axial force of the fixing bolt 50 . receive Then, the axial force of the fixing bolt 50 screwed to the boss female screw hole 13g of the boss portion 13f is applied to the cover 14, the nut 46, and the boss portion 13f of the motor housing 13. transmitted, and the cover 14 is firmly mounted to the motor housing 13 via the holder 40 . In this way, the installation of the cover 14 and the holder 40 to the motor housing 13 is performed.

In the above embodiment, the following effects can be obtained.

(1) Temporarily fix the cover 14 to the holder 40 by screwing the temporary fixing bolt 54 to the female threaded hole 49, thereby fixing the cover 14 and the holder 40 with the temporary fixing bolt 54. It can be pre-integrated using And the temporary fixing bolt 54 is removed from the female threaded hole 49 in the state which has arrange|positioned the cover 14 and the holder 40 integrated in advance in the predetermined position with respect to the motor housing 13. As shown in FIG. Here, the nominal diameter r1 of the female threaded hole 49 is larger than the nominal diameter r2 of the threaded portion 51 of the fixing bolt 50 . That is, the diameter r1 formed by the threaded tip of the female threaded hole 49 is larger than the diameter r2 formed by the threaded tip of the threaded portion 51 of the fixing bolt 50 . Accordingly, the screw portion 51 of the fixing bolt 50 can be screwed into the motor housing 13 while being inserted through the insertion hole 14h and the female screw hole 49, and the cover 14 and the holder 40 ) and the motor housing 13 can be fastened with a fixing bolt 50 . In this way, since the cover 14 and the holder 40 integrated in advance can be installed with respect to the motor housing 13, installation workability improves. Moreover, there is no need to previously integrate the cover 14 and the holder 40 by other fixing means. Then, the temporary fixing bolt 54 used for integrating the cover 14 and the holder 40 in advance is removed from the female threaded hole 49, and the fixing bolt 50 is inserted through the insertion hole 14h and the female threaded hole 49 ) was screwed to the motor housing 13 while being inserted, so that the cover 14, the holder 40, and the motor housing 13 were fastened with the fixing bolts 50. Therefore, as in the prior art, in addition to the fixing bolts 50 for fixing the cover 14 to the motor housing 13, it is avoided that the number of the temporary fixing bolts 54 and the number of the bolts increase is avoided. The enlargement of the compressor 10 can be suppressed. By the above, installation workability can be improved, suppressing enlargement.

(2) The holder 40 has a metal nut 46 and a resin holder main body 41 . The nut 46 has a female threaded hole 49 and is integrally formed with the holder main body 41 . And the nut 46 is clamped by the cover 14 and the motor housing 13. As shown in FIG. According to this, since the holder main body 41 is made of resin, the weight of the holder 40 can be reduced, and as a result, the weight of the electric compressor 10 can be reduced. Moreover, when the threaded part 51 of the fixing bolt 50 which passed through the insertion hole 14h and the female threaded hole 49 is screwed to the motor housing 13, the nut 46 is connected with the cover 14 and the motor. The axial force of the fixing bolt 50 is received in the state held by the housing 13 . At this time, since the nut 46 is made of metal, the axial force of the fixing bolt 50 can be preferably received while the nut 46 is held by the cover 14 and the motor housing 13 . As a result, the axial force of the fixing bolt 50 screwed to the motor housing 13 is easily transmitted to the cover 14 , the nut 46 , and the motor housing 13 , so that the cover 14 is attached to the holder 40 . ) to be firmly attached to the motor housing 13 via the .

(3) Since the circuit board 22 and the bus bar 33 are connected, the cover 14 and the holder 40 integrated in advance are arranged in a predetermined position with respect to the motor housing 13, When the temporary fixing bolt 54 is removed from the female screw hole 49 , the displacement between the cover 14 and the holder 40 can be suppressed. Therefore, the position of the insertion hole 14h of the cover 14 and the female threaded hole 49 of the nut 46 does not shift easily, and installation workability can further be improved.

(4) For example, after attaching the holder 40 to the motor housing 13 and then attaching the cover 14 to the holder 40, the cover 14 is attached to the motor housing via the holder 40 ( 13) is considered. In this case, an arrangement space for fixing parts used to mount the holder 40 to the motor housing 13 and a space for arrangement of the fixing parts used to mount the cover 14 to the holder 40 are required. Therefore, the motor-driven compressor 10 is enlarged. However, in this embodiment, the arrangement space of the temporary fixing bolt 54 used for integrating the cover 14 and the holder 40 in advance is the motor housing 13 with the cover 14 interposed with the holder 40 interposed therebetween. ), since it can be used as an arrangement space of the fixing bolt 50 used for mounting to the , miniaturization of the motor-driven compressor 10 can be achieved.

(5) There is no need to separately form a hole for inserting the temporary fixing bolt 54 in the cover 14, so that the airtightness of the space accommodating the motor control device 21 is not easily damaged. (10) can improve the installation workability.

In addition, the said embodiment can be changed and implemented as follows. The above-described embodiment and the following modifications can be implemented in combination with each other within a range that is not technically contradictory.

○ In the embodiment, the holder main body 41 may be, for example, made of metal. In this case, the nut 46 does not need to be integrally formed with the holder body part 41 . And, for example, the tip end of the boss portion 43 of the holder 40 is in contact with the inner surface 14d of the bottom wall 14a of the cover 14, and the holder body portion 41 and the boss portion ( 43 ) may function as a support column held between the inner surface 14d of the cover 14 and each boss portion 13f of the motor housing 13 . In this case, a female screw hole is formed inside the communication hole 44 of the holder body part 41 and the boss part 43. As shown in FIG.

○ In the embodiment, an inclusion may be interposed between one end of the cylindrical portion 47 and the flange portion 48 and the inner surface 14d of the bottom wall 14a of the cover 14 . In addition, an interposition may be interposed between the other end of the cylindrical portion 47 and the boss portion 13f of the motor housing 13 . The point is that the nut 46 should just function as a support post clamped by the inner surface 14d of the cover 14 and the boss part 13f of the motor housing 13. As shown in FIG.

○ In the embodiment, the holder 40 may have a base member interposed between the outer surface 13c of the bottom wall 13a of the motor housing 13 and the holder body 41, for example. do. In addition, the structure in which each electronic component 23 is mounted in the base member may be sufficient, for example.

○ In the embodiment, the motor-driven compressor 10 may have a configuration in which the motor control device 21 is disposed radially outside the rotation shaft 15 with respect to the motor housing 13 , for example. The yaw is that the compression unit 16 , the electric motor 17 , and the motor control device 21 do not need to be arranged side by side in the axial direction of the rotary shaft 15 in this order.

○ In embodiment, the compression part 16 is not limited to a scroll type, For example, a piston type, a vane type, etc. may be sufficient.

○ In the embodiment, the motor-driven compressor 10 constitutes a vehicle air conditioner, but the present invention is not limited thereto. For example, the motor-driven compressor 10 is mounted on a fuel cell vehicle and supplied to a fuel cell. Air as a fluid may be compressed by the compression unit 16 .

○ In embodiment, the fixing bolt 50 consists of the head part 52 and the cylindrical shaft part, the thread part 51 is formed in the front-end|tip of the shaft part, and the outer diameter of a shaft part is an insertion hole. The structure may be smaller than the hole diameter of (14h) or the nominal diameter of the female threaded hole (49). In this case, the shaft part is screw-engaged with the housing 11 by the screw part 51 at the front-end|tip, inserting through the insertion hole 14h and the female threaded hole 49. As shown in FIG.

○ In embodiment, the motor housing 13 which is a part of the housing 11 may be divided into one housing member which accommodates the compression part 16, and the other housing member which accommodates the electric motor 17. .

○ In the embodiment, the cover 14 and the holder 40 may be fastened to any housing member as long as they are a part of a housing housing the compression unit 16 and the electric motor 17 . For example, it may be fastened to the discharge housing 12 instead of the motor housing 13 .

○ In the embodiment, the motor-driven compressor 10 has a configuration in which the motor housing 13 is a suction chamber, but may have a configuration in which the discharge chamber is used instead.

10: electric compressor
11: housing
14 : Cover
14h: insertion hole
16: compression unit
17: electric motor
21: motor control unit
22: circuit board
30: external power
31: external connector
32: connector connection part
33 : bus bar
40: holder
41: holder body part
46: Nut functioning as a support column
49: female thread
50: fixing bolt
51: screw part
54: temporary fixing bolt

Claims (4)

A compression unit for compressing the fluid;
an electric motor for driving the compression unit;
a motor control device having a circuit board for driving the electric motor;
a housing accommodating the compression unit and the electric motor;
a cover for accommodating the motor control device;
and a holder for holding the circuit board;
The cover is an electric compressor mounted on the housing,
An insertion hole through which a fixing bolt screwed to the housing is inserted is formed in the cover;
In the holder, a temporary fixing bolt for temporarily fixing the cover to the holder and a female screw hole capable of screwing are formed,
The nominal diameter of the female threaded hole is larger than the nominal diameter of the threaded portion of the fixing bolt,
wherein the fixing bolt is screwed to the housing at the screw portion while passing through the insertion hole and the female screw hole to fasten the cover, the holder, and the housing. The method of claim 1,
The holder has a metal support post and a resin holder body,
The support pillar is integrally formed with the holder body part with the female screw hole,
The said support pillar is clamped by the said cover and the said housing, The electric compressor characterized by the above-mentioned. 3. The method according to claim 1 or 2,
and an external connector to which an external power source is connected;
The external connector is
a connector connecting portion that normally protrudes from the cover;
and a bus bar held at the connector connection portion;
and the circuit board is connected to the bus bar. A compression unit for compressing the fluid;
an electric motor for driving the compression unit;
a motor control device having a circuit board for driving the electric motor;
a housing accommodating the compression unit and the electric motor;
a cover for accommodating the motor control device;
and a holder for holding the circuit board;
The cover is a method of manufacturing an electric compressor mounted on the housing,
an arrangement step of disposing the holder in the housing in a state in which the cover is temporarily fixed to the holder by screwing a temporary fixing bolt to the female screw hole formed in the holder;
a removing step of removing the temporary fixing bolt from the female screw hole in a state in which the holder is disposed at a predetermined position with respect to the housing after the disposing step;
After the removing step, the screw portion of the fixing bolt passes through the insertion hole and the female screw hole formed in the cover in this order and is screwed to the housing, whereby the cover, the holder, and the housing are fastened by the fixing bolt. A method for manufacturing an electric compressor, comprising a fastening step.

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